code: def test(self):
      vec_env = chainerrl.envs.SerialVectorEnv(
          [mock.Mock() for _ in range(3)]
      )
  
      wrapped_vec_env = VectorEnvWrapper(vec_env)
  
      self.assertIs(wrapped_vec_env.env, vec_env)
      self.assertIs(wrapped_vec_env.unwrapped, vec_env.unwrapped)
      self.assertIs(wrapped_vec_env.action_space, vec_env.action_space)
      self.assertIs(
          wrapped_vec_env.observation_space, vec_env.observation_space
      )
  
file_path: chainerrl/tests/wrappers_tests/test_vector_frame_stack.py
imports: import functools
  import unittest
  from unittest import mock
  from chainer import testing
  import gym
  import gym.spaces
  import numpy
  import chainerrl
  from chainerrl.wrappers.atari_wrappers import FrameStack
  from chainerrl.wrappers.atari_wrappers import LazyFrames
  from chainerrl.wrappers.vector_frame_stack import VectorEnvWrapper
  from chainerrl.wrappers.vector_frame_stack import VectorFrameStack
label_desc: Use image node_id 1 for calling the TestVectorEnvWrapper obj's underlying member method code with example usage: obj.test() without return types